Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bd90992d94e979…

MALICIOUS

PDF

79.8 KB Created: 2021-07-08 20:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6befbdd220b9d42f91a9240867f76146 SHA-1: dfbff7a552f24982b377e02681f718d3ce7de114 SHA-256: 18bd90992d94e979fde944a780cca67aaa3f5dc977d34a8469a0998874dfbc7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e71daf858553d4467abd988f97cbaa0a/87300331665.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/21742938835.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/siwalasenedirejogub.pdfIn PDF document text
    • https://medtek.vn/storage/file/gixugav.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210627155819045.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa13ae1c3---14240209865.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/puxidopugevedavepe.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/48675064994.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/ramudifoxejawanajigonuzo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dee519a3d738dc999260d7e3e45eae62/62099681421.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/32341939886.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/49303709356.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160856c0ce1a66---vujaweputawagux.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f68c26536---tagonurivegomatatal.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/fafopin.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/52d63659917d3edd4f949bc7bb492af5/wojofeworekasi.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210527180815.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/lukekakebozamozivetamib.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbfdbd6830---36118258069.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0a0d685f681bfbf31b36ed5e1a4f6412/gikofegifofore.pdfIn PDF document text
    • https://premiersuli.hu/files/files/jizatowig.pdfIn PDF document text
    • https://jagominum.com/contents//files/miwosozafugeno.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a6ac70259e9759dc33926cb4731b100d/81905340459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=3+day+functional+training+programPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 17988 bytes
SHA-256: 10afd2f1510d87debf827c2cfebdb1919b7f9e9537c15c7d9bcb850bb889945b

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